Here are three World War II–era musicals in which Warner Bros.' leading stars sing, dance, and poke fun at themselves in support of the war effort. This Is the Army was the top-grossing movie of 1943 and featured the Academy Award–winning music of Irving Berlin and Kate Smith's defining performance of "God Bless America." From the same year comes Thank Your Lucky Stars, in which a group of young talents (played by established stars) puts on a benefit show for the war, featuring an Oscar-nominated score by Frank Loesser and Arthur Schwartz. GIs mingle with the likes of Bette Davis, Joan Crawford, Jack Benny, John Garfield, Roy Rogers, and others at the Hollywood Canteen, a three-Oscar nominee from 1944.